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post #1 of (permalink) Old 07-08-2009, 01:42 PM Thread Starter
Journeyman
 
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o/t- fuel pressure reg on 5.7L Tahoe

hey everybody

this prolly belongs on the chevy forum, but there's never anyone over there....


I just got a call from my pal on a road trip, his 97 tahoe with a 350 wasn't starting. A shop told him it was a bad fuel pressure regulator, which i guess is located inside or under the intake manifold...the shop wants $500 to replace it...BOO!

So he replaces this fuel press. regulator on the side of the road, gets it all back together fine *he thinks*

now come the problems:
1. he says he hears a popping from the throttle body
2. the engine stumbles at first start, then revs to 5000rpm by itself,then it dies.

any ideas out there on this one?

thanks very much
tim

Last edited by Tim-E; 07-08-2009 at 01:46 PM.
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post #2 of (permalink) Old 07-08-2009, 10:41 PM
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It sounds like the new one is bad also. post it on the chevy forum. shorts will pick it up and can answer it.

73 CJ5 And 2 Ranchers.
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post #3 of (permalink) Old 07-09-2009, 09:16 AM
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My research of GM TBI (since recent conversion) shows that the fuel pressure regulators infrequently go bad. Not that it can't, but it's rare. The FPR is located on the TB itself and is a simple [adjustable with mods] spring loaded diaphragm type. I'd be leaning more towards a bad fuel pump or clogged filter on the frame (earlier models were just below the firewall)...

Unfortunately, none of this is diagnosable by phone! If he's not getting codes thrown (lit CES/SES lamp should indicate this), and depending on whether there's fuel present at the injectors (nice crisp cone, dribble, or none?), a fuel pressure gauge would tell a lot here.

Also, maybe his missed 1 of the numerous wiring connections in that area? Easy enough to do & miss...

Caver Dave
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